Cita APA (7a ed.)

Hopkins, C. G. (1910). Soil fertility and permanent agriculture. Ginn.

Cita Chicago Style (17a ed.)

Hopkins, Cyril G. Soil Fertility and Permanent Agriculture. Boston, New York: Ginn, 1910.

Cita MLA (8a ed.)

Hopkins, Cyril G. Soil Fertility and Permanent Agriculture. Ginn, 1910.